Crane and like hoisting apparatus



1. JARDINE.

CRANE AND LIKE HOISTING APPARATUS. APPLICATION men DEC.16. 1920.

1,368,157. Patented Feb. 8,1921.

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J. JARDINE.

CRANE AND LIKE HOISTING APPARAT US.

APPLICATION men DEC. 16. 1920.

1,368,157, 1 Patented Feb. 8,1921.

2 SHEETSSHEET 2 UNITED STATES FATENT OFFICE.

CRANE AND LTKE HOISTING APPARATUS.

Specification of Letters Patent.

Patented'Feb. 8, 1921.

Application filed December 16, 1920. Serial No. 431,220.

To all whom it may concern:

Be it known that I JOHN JARDINE, a subject of the King or Great Britain, residing at Kings House, Kingsway, in the county of London, England, have invented new and useful Improvements in and Relating to Cranes and like Hoisting Apparatus, of which the following is a specification.

This invention relates to hoisting 'appa ratus in which provision is made for lufiing, or derricking, movements and in which devices are employed for causing the sus' pended load to move in a horizontal, or approximately horizontal, plane, while the jib, or the like, is being raised or lowered, the object of this invention being to obtain the aforesaid result by means which are much simpler than those heretofore employed, or proposed.

Such means as hitherto proposed have comprised a pulley over which the hoisting rope, or chain, passed, the said pulley having been proposed to be carried by a trolley movable along the jib, and, in some cases, to be operated by a rope, or chain, passing over other pulleys, one of these being so mounted that it could be caused to approach, or recede fronnthe other of the said pulleys, the movements of the first named of the said pulleys being controlled and regulated by a toothed wheel, or sector, which could turn with the jib, or the equivalent, about its derricking center.

According to the present invention the rope, or chain, which operates, or controls, the trolley is at one end anchored to, or connected with, a member, carried on, or by, any suitable movable, or stationary part of the apparatus such as the jib, or the superstructure and, at the other end, is connected with, or to, the trolley and at any suitable part between its two ends passes over a member such as a cam, lever, or the equivalent, having such movement relatively to the luffing, or derricking, movement of the jib that the trolley moves along the jib to an extent such as will cause the load to travel in a horizontal, or other predetermined, path when lufiing or derricking. The said cam, lever, or the equivalent, mounted, or carried as aforesaid, (directly, or indirectly) either on the jib, or superstructure, or some part in connection with either, is operated by a member movable relatively to the jib which member may be virtually a continuation of the rope operating the trolley.

The accompanying drawing illustrates in a diagrammatic manner a derrick crane provided with what is, I consider the best means for carrying the present invention into effect, but I do not limit myself to these precise means.

Figures 1 and 2 are side elevations respectively showing the jib lowered and raised.

The rope, or chain, 1, which controls the trolley 2, is connected, at its lower end, to the part of the cam, or snail, 3,'of smallest radius, the other end of the said rope, or chain, 1, passing over the pulley 4, mounted upon a center-pin 5, at the head of the jib 6, and being connected, at 7, to the trolley 2, which can slide up and down in guides 8 in the jib 6. The rope, or chain, 9, by which the jib 6 is raised and lowered is connected at one end to, or to some part in connection with, the head of the jib 6, and at the other end to a pulley, or drum, 10, which is keyed to a shaft 11, to which the cam, or snail, 3, is also keyed. The rope, or chain, 12, by which the load on the hook 13, is raised and lowered, passes over the pulley 2 and is wound upon, and unwound from, the winch 1.4;, and is shown as being supported by a roller 15 carried upon the shaft 11.

hen the jib 6, is raised upon its center 16 on the supporting structure 17 by rotating the shaft 11, and consequently the pulley, or drum, 10, suliiciently, the cam, or snail 3. will correspondingly move through suflicient of a rotation to cause the rope, or chain, 1 to unwind from the said cam, or snail, and allow the trolley 2 and pulley 2, to descend in the guides 8, on the jib 6, sufiiciently to keep the load on the hook 13, in the same, or practically the same, horizontal plane and when the jib 6 is lowered by rotating the pulley or drum 10, in the reverse direction the cam, or snail, 3, will take up a corresponding amount of the rope, or chain 1, to haul up the trolley 2 and pulley 2 in the guides 8 on the jib G, to an extent in accordance with that of the descent of the jib 6 to still keep the load on the hook 13 in the same, or practically the same, horizontal plane.

Although the cam, or snail, 3, is shown of non-circular form and the pulley, or drum, 10, of circular form, the invention is not limited to this as the varying compensating effect can be obtained by suitably varying the formation of either the said snail, or cam, or the said pulley, or drum, or both of them; or, in some cases, both the said parts may be circular.

It will be understood that the invention is not limited to mounting the parts by which the respective ropes, or chains, are manipulated upon the particular portions of the apparatus illustrated as they can be mounted upon, or carried directly, or indirectly, by, any other convenient portions of either of the supporting structure, or the 'ib. J In the following claims the expression chain includes a rope and the expression cam includes a lever, or the equivalent.

What I claim is 1. In hoisting apparatus, a pivoted jib, a

V pulley movably supported by the jib, a hoisttrolley slidable thereon, a hoisting cable supported by the trolley, a trolley cable, a jib cable, a winding mechanism for the jib cable, an associated cam directly engaged by the trolley cable, and means for operating said jib cable winding mechanism and the cam device in harmony to maintain the load on the hoisting cable at a substantially constant elevation during the rise and fall of the jib.

3. In hoisting apparatus, a pivoted jib, a trolley slidable thereon, a hoisting cable supported by the trolley, a trolley cable, a jib cable, a winding drum for the jib cable, a cam fast on the drum axis and engaged by the trolley cable, and means for rotating the winding drum and cam to lift or lower the jib While maintaining the load on the hoisting cable at a substantially constant elevation.

In testimony whereof I have signed my name to this specification in the presence'of.

two subscribing witnesses.

JOHN JARDINE.

Witnesses: V

G. F. TYRON, L. WALTER. 

